Hammer



May 26, 1942. N. c. wooDlN HAMMER Filed March 2s, 1941 2 Sheets-Sheet lwww arzaa 6.7%

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l l L I l Illrfllllliir! Ii li tIL il! May 26, 1942. N. c. wooDlN HAMMERFiled March 28, 1941 2 Sheets-Sheet 2 atentec May 26, 1942?l A OFFICE frHAMMER Norman()l Woodin, Rock Island, Ill. 'Application March 2s. 1941,serial No.V 385,762` eciaims. (c1. 12s-33) This invention relates tohammer mechanism of the mechanically driven type, as. contrasted' withpneumatic hammers, and will-beA described as applied to a portablegasoline engine driven hammer. f 1 1 l The general object of theinvention isito provide more mobile, effective and cheaper equip--V mentthan the conventional cumbersome, :expensive pneumatic equipment used byconstruction contractors, quarry men and the like for wrecking,drilling, tamping, spike driving and similar operations. Y Theparticular object of vthe invention is to provide a light, strong Vandpowerful hammer driven mechanically rather than pneumatically. Anotherobject is to provide a hammerthat will strike a relatively heavy blow inslower rhythm than conventional pneumatic hammers.

And a still further object is to provide a hammer mechanism wherein thereaction or 'rebound forces lare largely absorbed vwithin'the hammeritself. 1 f

Other objects and benefits will be disclosed in the followingdescriptions and drawings in which:

Fig. 1 is a front elevation view of my hammer with one section brokenaway to disclose the arrangement of interior parts; and i Fig. 2 is aside elevation View of my hammer with the upper section broken away, as.indicated in the section lines2-2 of Fig. 1, to better show the hammermechanism.

Now referring to the figures, and at the out- Y set particularly toFig.y l, I designate the power source, in this instance a gasolineengine, by the numeral 5. It will be understood, of course, that anysuitable source of power, such as an electric motor, may be-substitutedfor the gasoline engine. The engine is Supported on a base 6 integralwith the main frame of the hammer l. A double V-belt drive pulley 8 ismounted on the engine shaft and through dual V-belts 9 drives the drivepulley I journaled on the main shaft II which is suitably mounted inball bearings I2 and I3. A cone clutch I4 co-acting with a female clutchI0' on the pulley I U'provides the driving connection. The clutch I4 hasa yokebearing extension I4' which is mounted on a conventional over-rideclutch of .the roller type I5, and this entire clutch mechanism,including the cone clutch I4, is urged inwardly into clutching contactwith the pulley I0 by the compression spring I6. Control means for theclutch is provided by va conventional vyoke lever I'I actuated by thelink I8 and handle I9. It will be appreciated that the operator whilesupporting the hammer by the handles 21)V and 2I, may stop hammeroperatimlA by gripping theA handle I9 against the handle 20 andmay startthe hammer by releasing his gripl This is a conventional method forcontrolling hammer operation, and it is believed thatwith theaboveexplanation the operation ofl the device -will be well understood.

TheA use of the Yoverfride clutch I5 vwilljbe readily appreciated .whentheoperation of the hammer mechanism is explained and its use is neces-Asitated by the fact that provision must be madel to permittlie'hammer'tol move fasterthan the normal driving s 1: lee:lofrv thepulley, Vand thisl requiresV the use of an over-ride clutch, asis wellunderstood in mechanicaj v Y Now'referring to Fig. 2, the hammermechanism is shown as it -would vappear on' thevsection lines 2-v-2V o fFig. l. The main drive shaft I'I-is shown in section and affixed on itis the crank f 22 carrying 'affla-ngecroller'23 slidable inthe slotvconnectorv linkinturnispivotallyl attached vto the hammer 33. A rollerv3| is mounted on the same pivot pink connecting the links 30 and32. ItWill benoted thatA the link 32 has anextension 32' rextending upwardbeyondA the pivot point and that between the links 30 is fixed a fillerplate 30. It' will readily be' appreciated that the extension 32 Vwillstrike the filler plate 304 at a point .which will preventthe links3|3and 32- from pivoting inward beyond the dead center point and,therefore, all pivotal action of the links 30 and 32 must be outward.This action is aided' by the leaf spring 34 bolted `on the ller plate 30and held'by lock nuts 35. Limitation of this movement is 'provided Ybythe angle guide 32'.

By referring to the dotted outline of the mechanism as shown in Fig. 2,and appreciating that the crank 22 revolves clockwise, -it will beunderstood that the roller 23 picks up .the arm 25 near its outward endand moves the mechanism upward, the hammer 33 moving vertically in itsbearing and the rollers 28 and 3| being held in the guideway 29. As thecrank 22 rotates clockwise, it will be appreciated that its leverageaction through the roller 23 in the slide 24 is relatively slow, butafter the crank passes the hori- Azontal it becomes faster and faster,reaching its maximumY high speed leverage when the crank reaches .theopposite horizontal position.v Therefore, the hammer 33 is raised slowlyand then driven downward faster and faster asthe links` 30 and 32 areheld in straight line position by the guides 29,- reaching its maximumdriven speed at the right hand horizontal position` ofv the crank 22.The hammer being relatively heavy, it will then move faster than thedrive mechanism and this explains the necessity for 'the overl-ridedrive clutch I5.

The hammer 33 has an anvil shoulder33f oniv its bottom end whichstrikesr an anvil Sjlfwhich is lightly spring-retained upward by acompres= sion spring 35. The anvil 34 `in turnstrikes" maybedrivenfra-pidly or slowly'` accordance with the character of the worktovwhich it is applied, and; therefore,4v the hammer 33 may be stoppedinits travel over ja considerable-range. When a short stroke occursvthedrive, arms mayslide inward onf theslide1=bracket 21 and the links and-32 Y' may Vpivotall'y collapse'in Y orderto permit the crankf 2-2-tocontinue to rotate. -It'wi-ll; therefore,- ben apparent that I .havedeveloped a mechanism whereinfthe-hammer v33 is picked upv by levers,then driven downward withl great force in al manner which permits free'hammer action; It willalso bel apparent thatthe hammer action iscompletelyldeveloped with-- in the hammer itself by-inertiarforcesandthe re-activelorcesj will be absorbed-within the hammer andA nottransferredV to anygextentrtothe operator.Y s y Having thusvdescribed myinvention-y1- claim tl `l. In a powerV hammer, a frame structure, ahammer-V slidable in said Vframe, power means mounted on said frame;transmission means, in# cluding a manual andiover-friding clutch, arotatable crank` driven by said transmission, a pivotal and slidableKlever actuated bysaidA crank, toggle links connecting saidl lever and'hammer, means to hold said llever and linksin driving relation to thehammer, andmeansito permit free pivotal action of` said lever' and whenthe hammer ends its power' stroke, wherebyth'e rotatable crank andllever mechanism' may con-'- tinue to operate freely under variablestrokes Vof the hammer. j y

2.- In a power hammer, al frame structure, a

`ham-mer slidable in saidV frame, powerj means mounted on said frame, arotatable crank drivable by said power means, means to control therotation of said crank, a pivotal and slidable lever actuated by saidcrank, toggle links connecting said lever and hammer, means to hold saidlever and links in driving relation to the hammer, and means to permitfree pivotal action of said lever and links when the hammer ends itspower stroke, whereby the rotatable crank and lever mechanism maycontinue to'operate freely under variable strokes of the hammer.

3. In a power hammer, a frame structure, a hammer slidable in saidframe, power means mounted on said frame, a rotatable crank drivable bysaid power means, means to control the frotating and reciprocatingmotion, and guide means-toycontrol said connecting mechanism toprovidedirect reciprocating motion to the hammer' oriitsl lift and..down drive strokes, but to loosen said connection and to permitindependent rotation of the crank whenthe hammer is near the end of itsVdrive stroke.

4. In a power hammer, a frame structure, a hammerslidable insaid frame,a lever and link mechanism attached to said hammer, a rotatable crank.to actuate said mechanism, power means todrivev said crank` and-controlmeans co-acting withsaid lever and. linkimechanism` to provide directrecipro'catingdrive'connection to `the hammer until near the end of itsdriving stroke. where the hammer is freed from; said direct connectionto permit .independent rotation of the crank.v 5.V In a` powerhammer,.a: frame, a hammer slidablymounted in: thel frame, a lever and4link mechanism attached toi said hammer, a'rotatable crankto actuatesaid mechanism and reciprocate the.v hammer,v the, arrangement of theVVcrank and link mechanismproviding-a: faster down stroke ofthehammer'than its up stroke, power means to'drive the crank, and anovereridingfclutch between'gsaid power means and crank to permitfaster,rotation ofV thecrank than" its normal Vdriven speed.

i 6.1 In al power hammer,v a frame, a hammer slidably mounted 4in theframe, a lever and link mechanism attachedtoI said hammer, a rotatablecrank to actuate. said mechanism and reciprocatelthe" hammer, the.arrangement ofthe crank andV link kmechanism providing a faster downstroke of the hammerthanits: up stroke, power means'` to" drive thecrank, and control means coa-ctingwith said? lever andlink mechanism ytoprovide direct"reciprocating drive to the' hammer until near the Aendjof its drvingstroke where the hammer; freed, from. said `direct4connection to permit"irrdependentjrotation of the crank.

NORMAN C; woonnv.l

